Moomoo US Help Center-390 Professional Orders Rule
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Help Center Trading Ability Options US Stock Option 390 Professional Orders Rule

390 Professional Orders Rule

The 390 Professional Orders Rule is a regulatory guideline established by the Chicago Board Options Exchange (CBOE) to classify high-frequency options traders as professional Trader.
A customer is classified as a professional Trader if they place an average of 390 option orders per trading day in a calendar month within a quarter.
Moomoo Financial Inc does not support professional trading currently. If you qualify as a professional trader according to the 390 Rule, your accounts will then be limited to position close only for the next 3 months or for 1 quarter.

How Orders Are Counted Under the 390 Rule

Every submitted options order—whether filled, rejected, or canceled—counts toward the 390-order threshold, including:

✅ Single-Leg Orders

Each individual buy or sell order is counted separately.

✅ Complex Orders

  • 8 legs or fewer → Counts as 1 order
  • 9 legs or more → Each leg counts as a separate order

✅ Cancel and Replace Orders

  • Each modification counts as a new order
  • Exceptions apply when replacing "child" orders within a parent-child structure

✅ Pegged Orders

  • Orders that adjust based on Best Bid Offer (BBO) or National Best Bid and Offer (NBBO) count as a new order each time they update.
For a full breakdown of order classifications, refer to the CBOE Regulatory Notice: https://cdn.cboe.com/resources/regulation/circulars/regulatory/RG16-064.pdf

 

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